Walking stick



FIG. 1 is a perspective view of the walking stick showing my new design, the person shown in broken lines being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a right side elevational view thereof, the left side view being a mirror image of the right side view. 

The ornamental design for a walking stick, as shown and described. 